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Patch by Gleb Paharenko <gpaharenko@gmail.com> for dsniff >= 2.4b1, which
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adds checksum for libnids. For further information, please have a look to
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Debian bug ID #420129.
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--- dsniff-2.4b1/dsniff.c 2007-08-11 01:37:33.000000000 -0300
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+++ dsniff-2.4b1/dsniff.c.checksum 2007-08-11 01:38:55.000000000 -0300
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@@ -70,6 +70,80 @@
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{
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}
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+
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+static int get_all_ifaces(struct ifreq **, int *);
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+static unsigned int get_addr_from_ifreq(struct ifreq *);
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+
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+int all_local_ipaddrs_chksum_disable()
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+{
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+ struct ifreq *ifaces;
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+ int ifaces_count;
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+ int i, ind = 0;
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+ struct nids_chksum_ctl *ctlp;
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+ unsigned int tmp;
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+
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+ if (!get_all_ifaces(&ifaces, &ifaces_count))
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+ return -1;
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+ ctlp =
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+ (struct nids_chksum_ctl *) malloc(ifaces_count *
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+ sizeof(struct
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+ nids_chksum_ctl));
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+ if (!ctlp)
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+ return -1;
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+ for (i = 0; i < ifaces_count; i++) {
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+ tmp = get_addr_from_ifreq(ifaces + i);
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+ if (tmp) {
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+ ctlp[ind].netaddr = tmp;
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+ ctlp[ind].mask = inet_addr("255.255.255.255");
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+ ctlp[ind].action = NIDS_DONT_CHKSUM;
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+ ind++;
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+ }
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+ }
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+ free(ifaces);
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+ nids_register_chksum_ctl(ctlp, ind);
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+}
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+
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+/* helper functions for Example 2 */
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+unsigned int get_addr_from_ifreq(struct ifreq *iface)
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+{
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+ if (iface->ifr_addr.sa_family == AF_INET)
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+ return ((struct sockaddr_in *) &(iface->ifr_addr))->
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+ sin_addr.s_addr;
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+ return 0;
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+}
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+
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+static int get_all_ifaces(struct ifreq **ifaces, int *count)
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+{
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+ int ifaces_size = 8 * sizeof(struct ifreq);
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+ struct ifconf param;
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+ int sock;
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+ unsigned int i;
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+
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+ *ifaces = malloc(ifaces_size);
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+ sock = socket(PF_INET, SOCK_DGRAM, IPPROTO_IP);
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+ if (sock <= 0)
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+ return 0;
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+ for (;;) {
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+ param.ifc_len = ifaces_size;
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+ param.ifc_req = *ifaces;
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+ if (ioctl(sock, SIOCGIFCONF, ¶m))
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+ goto err;
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+ if (param.ifc_len < ifaces_size)
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+ break;
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+ free(*ifaces);
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+ ifaces_size *= 2;
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+ ifaces = malloc(ifaces_size);
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+ }
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+ *count = param.ifc_len / sizeof(struct ifreq);
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+ close(sock);
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+ return 1;
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+ err:
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+ close(sock);
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+ return 0;
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+}
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+
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+
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+
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int
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main(int argc, char *argv[])
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{
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@@ -189,6 +263,8 @@
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warnx("using %s", nids_params.filename);
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}
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}
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+
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+ all_local_ipaddrs_chksum_disable();
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nids_run();
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